GCF for 20 and 395

What is the Greatest Common Factor of 20 and 395?

Answer: GCF of 20 and 395 is 5

(Five)

Finding GCF for 20 and 395 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 395 is to list all factors for both numbers and pick the highest common one:

All factors of 20: 1, 2, 4, 5, 10, 20

All factors of 395: 1, 5, 79, 395

So the Greatest Common Factor for 20 and 395 is 5

Finding GCF for 20 and 395 by Prime Factorization

The second method to find GCF for numbers 20 and 395 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 20: 2, 2, 5

All Prime Factors of 395: 5, 79

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 20 and 395

GCF Table

Number 1Number 2GCF
53955
63951
73951
83951
93951
103955
113951
123951
133951
143951
153955
163951
173951
183951
193951
203955
213951
223951
233951
243951
253955
263951
273951
283951
293951
303955
313951
323951
333951
343951

About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Factor of 20 and 395? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '395'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder

FAQ

What is the Greatest Common Factor of 20 and 395?

GCF of 20 and 395 is 5